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microsoft/monaco-editor

Monaco Editor is a browser-based code editor library that provides syntax highlighting, IntelliSense, and language services via a modular, worker-based architecture. The system supports modern ESM and AMD module loading, with extensive tooling for bundlers like Webpack, Vite, and esbuild. It also includes a website with an interactive playground for testing editor features and a client for the Language Server Protocol.

50.1

Adequate · 2 August 2026

307k

lines of production code

JavaScript

with TypeScript

3

bus factor · 336 authors in all

2

measurements over time

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How it got here

2016–2021 · ESM migration and build tooling

The project underwent a significant architectural shift to support ES Modules and stricter TypeScript, accompanied by the introduction of a Webpack plugin and multiple build tooling samples. This period focused on modernizing the codebase's module system and providing comprehensive integration examples for various bundlers like Vite, esbuild, and Webpack.

17 changes

2022–2023 · Website overhaul and build system modernization

This period focused on a comprehensive rewrite of the project's build infrastructure and website architecture. The team introduced a new TypeScript-based build system and CI scripts, while simultaneously redesigning the website with a modern, accessible, and interactive playground environment.

19 changes

2025–2026 · Build system and architecture modernization

This period focused on modernizing the build infrastructure by migrating both AMD and ESM pipelines to Vite and Rollup, while introducing a new LSP client for editor integration. Concurrently, the codebase was refactored to improve performance and responsiveness by moving language processing into web workers and implementing lazy loading for language definitions.

10 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 2 August 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit 4ae151f00c — the exact code this score is about.
  • Scored under rubric rubric-2026.08.18. Score the same commit under that rubric and you get the same number.
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